#include<bits/stdc++.h>
using namespace std;

void solve() {
    int n;
    cin >> n;
    string s;
    cin >> s;

    for (int _ = 0; _ < 2; _++) {
        int i = 0;
        while(s[i] == 'W') i++;
        int st = i;
        int af = 0;
        for(;i < n; i++) if (s[i] == 'W') af++;
        if (st < af || (st+af) % 2 == 1) {
            cout << "NO\n";
            return;
        }
        for (int i = 0; i < 2*n; i++) {
            if (s[i] == 'W') s[i] = 'R';
            else s[i] = 'W';
        }
        reverse(s.begin(), s.end());
    }
    cout << "YES\n";
}
int main() {
    int t;
    cin >> t;
    while(t--) {
        solve();
    }
}